泵作透平时叶轮轴向力的数值计算与分析  

A Numerical Simulation and Analysis of Impeller Axial Force of Pumps as Turbines

作　　者：屈晓云[1] 孔繁余[1] 陈浩[1] 杨孙圣[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013

出　　处：《中国农村水利水电》2013年第7期96-99,102,共5页China Rural Water and Hydropower

基　　金：国家科技支撑计划项目(2011BAF14B03);江苏省普通高校研究生科研创新计划资助项目(CXLX11_0579);江苏高校优势学科建设工程资助项目

摘　　要：为了准确预测泵作透平时轴向力的大小,采用流场分析软件CFX对泵作透平进行了全流场三维数值模拟,获得了叶轮盖板、叶轮流道内表面、叶片的压力分布及腔体内液体角速度的分布情况。结果表明:泵作透平在最高效点时每级叶轮受到的盖板力并非相等,随着级数的增加叶轮受到的盖板力呈现越来越小的趋势,而各级叶轮受到的轴向力随着来流水头的增大逐渐增大;并且各级腔内液体角速度的平均值均要高于传统认为的叶轮角速度的一半,且该值并非恒定,范围为0.42～0.70倍的叶轮转速。In order to predict the axial force of pumps as turbines, computational fluid dynamics software CFX is adopted in the whole flow field numerical simulation of pumps as turbines. The pressure distribution is acquired in all the impellers cover plate and the blades surface. While the angular velocity distribution of liquid is achieved in the cavity. Results show that the axial foree of each im- pellers is not equal at the best efficiency. The value of axial force on first-stage impeller is larger than the next. With the inerease in water heads, the axial force of impellers goes up. The average of the liquid angular veloeity of all cavities are higher than the tradi- tional calculation value 0. 5ω. It ranges from 0. 42ω to 0. ？ω.

关 键 词：离心泵 泵作透平 全流场数值计算 轴向力 

分 类 号：TH311[机械工程—机械制造及自动化]